Not here - works fine. What happens when you try to launch?
Have you tried running a consistency check or rebuilding the library?
Hold down the "alt" and "Apple" keys when you click on the Aperture icon, and keep them held until you see a new window appear with those options.
I'd go for a consistency check first of all.
how would i go about doing that...
from what i have read i need to revert back to and earlier version... so hmm... how should i go about that...
I'm afraid I have no idea how to do that - it might be worth asking the question in the Aperture discussion forum on the Apple support site.
Where did you get this information from?